/**
*
* {@inheritDoc}
*
* @see \Core\Html\HtmlBuildableInterface::build()
*/
public function build()
{
// No content, no output
if (empty($this->content)) {
throw new HtmlException('There is no content set for this panel.');
}
foreach ($this->content as $content) {
if ($content instanceof HtmlBuildableInterface || is_object($content) && method_exists($content, 'build')) {
$content = $content->build();
}
$this->html->addInner($content);
}
return $this->html->build();
}